[1a(1aα,5β,9aα)]‐1,1a,4,5,7,8,9,9a‐Octahydro‐3‐hydroxy‐1,1,2,5‐tetramethyl‐7‐methylene‐6H‐cyclopropa[3,4]cyclo­hept[1,2‐e]inden‐6‐one

Interest in the title structure, C₂₀H₂₄O₂, lies in the novel cis ring junction between the three‐ and seven‐membered rings. This stereochemical arrangement causes the methylene moiety and the cycloheptane ring to be twisted out of the plane of the aromatic ring. The cyclopropane ring is also twisted out of the plane of the aromatic system. The molecules are linked by an O—H?O hydrogen bond O?O 2.741 (3) Å].